Automatic feed and delivery for platen-presses



P. L. WELLS AND F. W. HUNTER. n. '1. AND 0. l. WELLS! nommsmnons or P. L. WELLS, nsc'u.

AUTOMATIC FE ED AND DELIVERY FOR PLATEN PRESSES.

APPLICATION men nc.|e,19o7. RENEWED SEPT 2. 1914..

1,363,200, Patented Dec. 21, 1920.

8 SHEETS-SHEET l.

. P. L. WELLS AND F. W.' HUNTER.

N. 1, AND 0. l. WELLS, ADMINISTRATORS OF P. L. WELLS, ozc'o. AUTOMATIC FEED AND DELIVERY FOR PLATEN PRESSES. APPLICATION map DEC. |6,l'907- RENEWED SEPT. 2. I914.

1,3 3,200, Patented Dec. 21,1920.

8 SHEETS-SHEET 3- P. L. WELLS AND F. W. HUNTER. ".11. AND c. wms, ADMINISTRATORS or P. L. wms. 05cm. AUTOMATIC FEED AND DELLVERY FOR PLATEN PRESSES. APPLICATION FILED DEC. 16, I907. RENEWED SEPT 2. I914- 1,363,200, r Pmmed Dec. 21,192@."

8 SHEETS-SHEET 4.

P. L. WELLS AND F. W. HUNTER. N. I. AND c. WELLS. ADMINISTRATORS OF P. L. WELLS, DECD.

AUTOMATIC FEED AND DELIVERY FOR PLATEN PRESSES. APPLICATION FILED DEC-16.1.90?- RENEWED sEPT. 2. 1914.

1,363,200. Patented Dec. 21,1920.

8 SHEETS-SHEET 5.

44 kgg V 40 3 4 62 .22 I I 2 98ft 29 4 5% a P. L. WELLS AND F. w. HUNTER. I. AND C, L WELLS -ADM|N|$TRATOR$ OF P- L. WELLS, DEC'D- AUTOMATIC FEED AND DEUVERY FOR PLATEN PRESSES. I APPLICATION FILED DEC-15.1901- KENEWED SEPT- 2. 1914. 1,363,200.. Patented Dec. 21, 1920.

B SHEETS-SHEET 6.

P. L. WELLS AND F. W. HUNTER. N. 1. AND 0. I. WELLS, ADMINISTRATOBS or P. L. WELLS, DECD.

AUTOMATIC FEED AND DELIVERY FOR PLATEN PBESSES. APPLICATION FILED DEC. 16, 1.901. mzuzwzn SEPT. 2. 1914.

1,363,200. Patented Dec. 21, 1920.

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P. L WELLS AND F. W. HUNTER. N. J. AND c. 1. WELLS, ADMINISTRATORS OF P. L. WELLS, ozc'n. AUTOMAHC FEED AND DELIVERY FOR PLATEN PRESSES. APPLICATION man DEC.16.L907- RENEWEDSEPT. 2. 1914.

ANA 0 2 o 9 8 1 U 0 00 s e E D g d m 1.

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' deposition. v p r Moreover, the apparatus is preferably of 7 further feature of construction, also present FUN-Iran s'rATEs,

rmnson L. wELLs P'ATE'NT- OFFICE.-

AND FREDERICK w. HUNTER, OF BROOKLYN, NE W YORK; .NETTIE J'. WELLS, OF NEW YOBK, N. Y-, AND CHM I. WELLS, OF BROOKLYN, NEW YORK, ADMINISTRATOBS OF SAID PIERSON L. WELLS, DECEASED; SAID ADEINIS- IRATOBS AND SAID HUNTER ASSIGNOBS 'IQ KILLER SAW-TRIMMER COHPANY, OF PITTSBURGH, PENNSYLVANIA, 'A COBPQBATIOIT OF PENNSYLVANIA.-

AUTOMATIC rnnn am) nmirvnnv non Purim-names.

Specificationof Letters Patent. P t t d 21, 1 20,

Application filed December 16, 1907, Serial No. 406,803; Renewed September 2, 1914. Serial No. 859,917;

To all whom, it may concern: Be it known that we, PIERSON, L. WnLLs and FREDERICK W HUNTER, citizens of the United States, and both of the borough of Brooklyn, city and State of New York, have invented a certain 'new' and useful Improvement in Automatic Feed and Delivery .for Platen-Pres'ses, of which the following is a specification.

This invention bodies an apparatus for taking sheets of paper,.or other objects to be printed, from a'pile thereof, and placing them, one at a time, upon the platen of a press in proper position to be printed, and

for removing each printed sheet from the' platen and depositing it at a desired and convenient point contiguous to the press. Both these actions of placing the sheetv to be printed and of removing the printed sheet proceed continuously and automatically during the running of the press and as long as thereremains any blanks in the pile to be printed. I

A An apparatus made in accordance with .the present invention includes means for taking a sheet, ordinarily from a pile there- 'of, (and by the term sheet in this specification we .wish to include any object that has ordinarily been'used for printing, or. can be printed on a platen press and is susceptible of being transferred-to osition in the manner hereinafter set fort and sliding it onto and over. the t'ympan under the'i printed sheet to position against 'the gage pins. thereon. The apparatus further .includes meansadapted to pass under-the printed sheet, such means being conveniently included in. the means used to pass the blank sheet over that mpan, and which former means being with rawn carries with it the printed sheet to a point from whence it may be caused such a character and construction that it is capable of ready attachment to various types of platen or so-called ]0l) presses. A

in the preferredform of the apparatus, enablea constructive detailsof the feed and is a plan view thereof, the

to pass to the place of:

delivery mechanism to be, readily shifted to a position in which the ordinary hand.

feed of the running press or its make ready 1s not, interfered with. Conversely, theconstructive details of such mechanism can with equal facility be shifted back into operativeposition and timing with the'press.

A further object of the invention is to provide an automatic feed and delivery ture, the change from one character of sheet to another requiring a minimum of adjustment, readily understood and quickly made.

In the drawings accompanying the pres.-

entspecification, Figure 1 is a side elevation showing, in dotted outline a platen or job press of the well known @rordon type with which has been combined an automatic feed and delivery embodying the .features of the present improvements. Fig. 2 platen in this figure being in its open positlon instead of closed as in Fig. 1; the tape conveyer for removing the rinted sheet from the retracted platen eed fingers and also certain other associated parts are omitted for the sake of clearness. Fig. 3 is partly a plan,

- partly a horizontal section illustrating the position assumed by dparts ofythe' supporting frame ofthe fee and delivery mechanism when the latter has been shifted out of operative relation with the press. Fig. & is afront elevation lookin toward the inking disk of the press and this figure and the remaining figures being upon a somewhat larger scale than the preceding fi 'ures. 'Fig. 5 is a perspective View shows the support, slde guides, etc., for the pile ofsheets,

of the pile support and shiftable side guides 7 together with certain associated parts. Fig. 6 1s partly a plan, partly a cross section of the reinforcing plate for the pile support, the-side frames and the elevating screws and shows'means for enga ing the support with and disenga 'ng it rom' the screws. Fi 7 is a side e evation looking from the rig it in.

Fig. 4 and illustrates mechanism with both sets of upward to maintain the upper surface of the pile at approximately the same height necessitated by the withdrawal of the successive sheets from the top of the pile. Fig. 8 is an enlarged detail of the feed ratchet, pawl, pawl l1ftc1 etc. Fig. 9 is mainly a longitudinal section through the side shaft for transmitting motion from the driving shaft of the press to the driving shaft of the feed and delivery mechanism. Fig. 10 is a side elevation looking from the left in 4 and illustrates the sheet'sep'arating an feed or pile feed fingers, the platen feed ers and various associated mechanism for actuating them, the parts being in their relative position with t e platenfeed finers, still pressed against the blank sheet eneath, at the forward end of their stroke and which corres nds substantially to a similar position 0 the "sheet separating and feed fingers, the latter fingers having delivered a fresh sheet to the feed. rolls. Fig. 11 illustrates the u per portion of Fig. 10 ngers at the rearward ends of their respective strokes, the platen feed fingers about to slide a blank sheet onto the tympan and the sheet separating and feed fingers, a proximately ready to removea fresh sheet mm. the top of the pile. Fig. 12 is a detail view illustrating. the sheet separating and feeding device, the sheet separating and feed finger being at a point in its rearward movement with the sheet engaging foot above the surface of the pile and the jogger fingers being in their rearward position. Fig. 13 illustrates a relative position of the sheet aratin and feed fingers and the jogger ers during the action of separatin and eeding the top' sheet of the pile. 1g.-14 is a perspective detail of the runaround for controlli the movement of the sheet separating a feed finrs. Fig. 15 is a plan view of the sheet forwarding and registering device.

' Fig. 16 is a siole elevation of the same with "the support side, frame broken away to show the various shafts, levers, links, etc.,

" contiguous to and concerned in the action of the such device. Fig. 1? is a pore ective view, part of the framin being hro en away as well'as the forwa 'ng and registering device, eta, heing removed, and indicates various operative parts and connections. Fi i8 is a detail view of the cam for etc., for operatin the motion corrector of the laten feed ngers and for controlling al forward movement of those fingers whereby the engagement of the printed sheet with the hooks or stops on said fingers is assured. Fig. 19- is a detail showing one atom 20. is also a detail show- P one of the ten feed fingers in a posireason tion in which it is ready to feed forward a blank sheet onto the tympan, the printed sheet resting on the latter beingalso indicated. Fig. 21 is a perspective view illustrating means for locking the feed and delivery 'mechanismto the press and unlocking the same therefrom and assuring the withdrawal of the platen feed fingers to a position where they will not interfere with the running of the press. Fig. 22 is a perspective view illustrating the tape conveyor for removing the printed sheet from the platen feed fingers. r i

Similar characters The present invention comprises means for removing sheets to be printed, one at. a time, from'a pile thereof, and sliding each sheet over a surface which constitutes a continuation of the tympan surface and onto the latter surface sometime after the impressionaction has ceased, the position of the sheet" eventually approximat ng to or coinciding with its finalprinting position. The

present feed and delivery further and additionally embraces means for sliding the sheet to position as aforesaid by an action'which involves the passage of the sheet under the printed sheet broughtback with the platen in its opening movement. The removal of,

of reference nate corresponding parts in all figures.

ed to the automatic feeding and delivery of presses of other types, or it may be made a constituent part'of a press and provided for inthe manufacture of the latter.

When applied to an existing press, the power for actuating the feed and delivery is usually derived from the power shaft of the press and support afiorded by the framework of the rose. It being essential that the feed and de ivery be in proper timing'with the press movements we may, as in this embodiment,.where a separate driving shaft for the feed and delivery mechanism is provided give thereto a single rotation for each full movement of the press platen, inter osing suitable gearing between the aforesai driving shaft and the driving or power shaft of the press to accomplish this. v v k Proceeding now to a detail description of the various features of the invention as illustrated in an embodiment thereof applied to a Gordon press, 2i designates the ower or driving shaftoi the latter proyide with the usual fiy wheel '3 while thepressplaten is designated by&: y 7

platen.

naeaaoo The driving shaft of the feed and delivery mechanism is designated by 5 journaled in suitable bearings 5, 5, and which, as here designed, is disposed parallel toshaft 2 when the aforesaid mechanism is in its operative position and has-one complete rotation for each full. cycle of motion and dwell of the This result is here accomplished through the medium of a pair of spiral gears, or a worm and-worm wheel, one of which 6 is secured to the shaft 2, its meshing gear 7 being secured to a side shaft 8 mounted in bearings supported by a frame 'iece 9 ailixed to the frame of the press. Sha t 8 is adapted to drive a bevel gear 10 engaging with a bevel gear 11 secured to the aforesaid drivin% shaft 5.

. ne of the elements embraced in the resent invention is a device for taking s eets successively from a pile thereof and feeding them to a position from which they may be passed onto the tympan. Any particular construction or mode of operation ofsuch device is not essential to ,the present invention provided it accomplishes, the result aforesaid.- We therefore wish it understood that we are at liberty to utilize any appropriate type or character of paper feed mech- One form of such device is illustrated in the drawings, the same comprising a topfeed, sheet separating and feeding mecha nism with an automatically operative ele vator. I

Before however, proceeding to a detail description of such mechanism, it may be premised that for convenience in, supporting.

various shafts, levers, and other parts, we have indicated'a pair of side frames 12, 12, spaced a distance apart somewhat reater than the greatest width of sheet which the particular press to which the invention is applied is designed to'print, Tie rods 13, 14 and tie bar 15, 15' hold the frames rigidly together. It is within the space between the frames that the elevator for the pile of sheets is located.

Specifically,'the elevator and sheet sep-' arating and feed mechanisms include a pair of side guides, see Figs. 5 and 6, each constructed of upright bars 16 and each having an inner upright angle bar 17 against whic the inner edge of the pile rests. Each set'of bars 16, 17, is tied together by upper and lower cross ieces 18, 18. The en porton which the pile rests is designated y :19; it

.press may be stocked.

'which meshes with a. corres posite projection 19 may be substantially equal to the length of the largest sheet which the press is adapted to print,while said pro- -ject1ons are disposed opposite to and are in width somewhat less than the width of the spaces between the guide bars 16, 17;

As here designed plate 19 with which the bottom sheet of the pile contacts is secured 1 to a reinforcing plate19 beneath having the, same general configuration of central part 19' and projections 19 as the platealready described. rom plate 19 extends a dependent guide 20 which fits and is adapted to travel lengthwise of a guide bar 21. i

. Elevating screws 22 are indicated (one right, handed and one left handed in this instance) one extending lengthwise of a longitudinal bpening 22' in one side frame 12 and similarly as to the other frame. Each screw rotates in suitable end bearings 22 while an outboard bearing 22' for each screw slidable to and fro through a guide opening in a dependent flange 23' of plate 19. The inner ends of these slide bars are pivoted by ins 23 23 togglewise to a hand lever 24 ulcrumed by in 24' to plate 19. It is evident that in ig. 6 the slide bars are locked in engagement with the elevating screws and that if lever 24 is turned to the left, the bars being drawn inward, the pile support may be shifted to any position 'alon the guide bar 21 and operatlvelyreengage with the screws.

The side ides comprising the bars 16, 17, are ordmarily adjustable toward and away from each other to conform, at least approximately to the corresponding dimen sion of the sheets of the ile with which the n this instance the twoguides are made adjustable simultaneously toward and away from each other, although not necessarily so. That is to say, each such guide is here provided with an uper and a lower'nut 25, those on one guide in right handed, those on the other left han ed. En aging with each pair of oppositely threa ed nuts is a correspondin ly threaded screw 26 both screws being caps he of simultaneous rotation through the medium of a worm wheel 26' on. each shaft 26 nding worm 26' on a shaft 27 mouthed in arings 27 on a side frame 12 and provided with a conventhread of the contiguous elevating screw, and

lot

ing the pile of sheets as the latter are withdrawn thus maintainingthe upper surface of the pile at approximately the same point, that is within a practical llmit of variation, there is indicated an arm 29 (one or more) secured to a shaft .29 journaled in the side frames 12, 12 and adapted by the turning the ratchet teeth during the making of arm free to be separated from and of that shaft to be brought in contact with the upper surface of the pile or withdrawn therefrom. Iilxtendimgg; from shaft 29'is an actuating lever 29 to which one end of a link 30 is pivoted, the opposite end of the link being secured to a cam fork 31 "carrying'a cam roll 31 held in contact with a cam 32 on driving shaft 5 by a spring 33.

Secured to each elevating screw 22 is a bevel gear 34 meshing with a corresponding gear 34' on a cross shaft 34" journaled in the lower ends of side frames 12, 12. It may be provided with a hand wheel 34. Shaft 34 also carries at one end a ratchet wheel 34* with the teeth of which is adapted to engage a spring-pressed pawl 35 carried by a rocker, arm 35' which in turn is actuated by means such'as a crank pin 36 on shaft 5, a'connecting link 36' being interposed as shown. A pawl shifter 37 is indicated as adapted to vibrate in a path in which it may become operative or inoperative to withhold the pawl from engagement with 35'. The pawl shifter is here pivoted concentricallywith arm '35. and'an extension 37' of the body part of the shifter is connected by a link 38 withlever 29 It will be noted further that cam 32 embodies two substantially arc-shaped portions one '32 of less radius than the other 32 The parts are so proportioned and adi'usted and the timing is such that when r01 31" is on the part 32 of the cam, arm 29 is raised clear of the pile of sheets and theto sheet is 'fted ofi the pile. When, however, the cam roll dro s till off part .32 and arm 29 rests upon the pi e,-

one of two conditions may exist; the upper surface is substantially in the right plane for the designed action of the sheet separating and-feeding means or it is below that lane and the pileshould-be fed upward. he former condition prevailing, pawl shifter37 is so located as to hold the pawl out of engagement with the teeth of ratchet wheel 3d during the forward excursion of rocker arm- 35'. Under the latter condi tion, however, the pawl shifter is far enough to the right in Fig. 8 to permit the pawl to engage with the ratchet teeth. and

thereby turn shaft 34 and elevating screws edges.

t am

be stated, that it is contemplated the scope of the present automatic feed and de livery shall be ordinarily practically the same as the press, or in other words that. the mechanical embodiment of the invention shall becapable of feeding and delivering practically anything the press is capable of printing whatever the superficial dimensions of the sheet, its texture or its thickness-a result,,moreover,' attainable by a minimum of simple adjustment. The sheet se arating and feeding mechanism is, there ore,- 9rdinarily, one fitted alike to function with thick or thin, light or heavy sheets.

The articular type of such mechanism here, a opted for' fulfilling the. conditions aforesaid embraces, a sheet engager adapted to exert sufiicient friction on thesheet to shift the latter when the engager is actuated,

or to actually penetrate the substance thereof as by points. serrations, or sharp metallic When the sheet feeding means is of the type illustrated and particularlzed, a sheet retarder for restraining the movement of all sheets save the one on which the sheet engager presses will also ordinarily be used. I roceeding now to a description of the specific mechanism illustrated, 39 designated a sheet engager or pile feed finger (one or more) having a sheet engager part 39 of rubber, sand-paper, etc., adapted to press a ainst and engage with the upper sheeto is rigidl securable to a sleeve 40 see Fig. 17, loose y mounted on a tie rod 40' connecting the u per ends of rock arms 41, 41, extending rom a rock shaft 42 ournaledm forward extensions 12, 12', of the side frames 12, 12. A cam 43 on the driving shaft 5, with its usual cam fork 43, cam roll 43 and returning spring 43 serves to actuate shaft 42 through a connectinglmk .43 pivoted at its upper end to an arm 43 the pile P, see Fig. 11. Finger 39 of the shaft. .Sleeve 4.011s thus given a la'teral forward and backward movement while its axial rocking to maintain the sheet engager in engagement with the sheet dur ng the forward'lateral movement of the shaftv and inclosing sleeve, its rise therefrom as it reaches the. forward extremity of its movnient, its backward travel above and clear of the pile, and its descent on the'fresh upper sheet thereof, is governed by a motion controller consisting of an arm 44, r'igid with sleeve 40 and having a projecting pin 4%, and a runaround 45 with which pin 44'- This runaround I embodies a weighted track flange 45f pivis ada ted to cobperate.

otally mounted at 45 on a plate 45 for the attachment of the runaround to one of the side frames 12. At the-forward end there is an upwardly extending lip 45 which, when pin 44' comes in contact with it during the forward travelraises the sheet engage! from the sheet. Thereafter, track 45' which has previously been rocked upward by the pin, drops back. The pin on its backand an engaging chain 48 ward movement now rides on the track,

above its position for forward movement until it ap roximates Its extreme rearward position w ereupon it drops through an opening 45 and the sheet engager again rests upon thepile, with the pin 44" above a safety track 45 which precludes the descent of the sheet en ager beyond the vertical range within-w ich it properly functions. Ordinarily the overbalanced weight of the parts suflices to hold the engager with sufiicient firmness against the sheet to cause its movement therewith. One or more sheets are thus shd forward onto a platform 46 which connects by a rounding edge with asto plate 46 for the upper end of the pile. n order to assure the movement of but a single sheet by the pile feedfinger during the last portion of its travel, a sheet retarder is rub er block 47 (one ormore) extending somewhat above the surface'of the platform. lhis retarder exerts suiiicient friction upon all the moving sheets, by reason of the pressure of the sheet'engager toarrest the movement of'ail save the uppermost sheet which alone continues its movement since it is designed that the forwardly urging force exerted by the sheet engager shall be in excess of the frictionally retarding force between the sheet and the sheet retarder.- The forward movement of the pile feed fingeris sufthe edge of the underlyficient to carry ing sheet'into the bite of lower-and upper sets of gripper rolls, the former set 48 being mounted on ashaft 48' journaled in the side frames 12, 12 and suitably rotated, as bystep-up meshing gears 48 48 gear 48 joeing secured to said shaft and gear 48 being mounted on a sleeve 48 journaled on a stud 48 on the side frame, see Fig. 10. This sleeve may be rotated by sprocket chain drive comprising asprocket 48 on the stud,

as sprocket 48 rigid with driving shaft 5 The upper set of gripper rolls 49 is shown as a gravity roll the same'bemg secured to a shaft 49' slidably mounted inslots 49 of the side frames 12 12.

It is to be noted that the underlying sheets started by the sheet engager and left in engagement with the, sheet retarder upon the completion of the forward inovement of the engager or pile feed arm, lap over upon and isclosed embod 'ng a friction surface such as that'of a coverthe retarder more or less. If therefore each sheet were started forward from the position in which it was previously left on theretarder, thelatter would in a. short time be completely covered over and there fore improperly function or fail tofunction at all to prevent the complete forward movement of but asingle sheet. It is therefore advisable to return all shifted and retarded sheets to approximately the same starting position before, the sheet engager is again moved forward. For this purpose a set of jogger fingers 50 may be used working in slots 50 in the platform 46 and shiftable from a osition in which their ends (having a width in such position measured up and. down of the 'pile somewhat greater than the aggregate thickness of the sheets likely to be'started by the forwardly mov-' mg sheet engager) are approximately in line with the pile stop 46' to aposition in which they are out of the path of the moving sheet. This jogging movement (toward the pile) takes place when the sheet engager is free of the pile while it is shifted forward out of the way of the moving sheet in time to avoid all inference therewith. It may for'instance move back and. forth in unison with the sheet engager and at the s'amerate of speed as the latter. This is the case in the present embodiment in which the jogger fingers are additionally shown as capable of rocking from one of the aforesaid positions to the other, they being further indicated as curved and connected to a somewhat upward movement of the sheet.' It, is contemplated that this action againstgravity will eliminate the necessity for a back stop to prevent the ovenrunning of the sheets under the action of the jogger.

In those instances in which the pile elevatoris located considerable distance from the platen (it being in the particular the inner side of nus case situated at the "outerends of the usual table brackets 51 commonly provided as a part'of the framework of this press) a for-- warder is necessa for continuing the movement of the s set toward the platen after the sheet engager has been withdrawn. For this purpose there is utilized in" this instance, the aforesaid sets of gripper rolls 48, 49 and a tape eonveyer embodying tapes 52 running over,-and driven by, the driven aline the sheet edge, with the stop surface,

. the lower edge 0 the ,sheet when in its final v and thus correcting any angular irregularity which the sheet may have when passed onto the tapes.

'1 he stop employed in the present apparatus for holding the sheet against the friction of the runnm' tapes com rises a series of stop pins 55 w ose stop aces are disposed in a line arallel to. the direction of registered or printing position against the usual lower ga 0 pins on the tympan.

While the a oresaid stop pins are in their operative position prior to the time that the moving sheet is likel to be brought against their stop faces by the traveling tapes and so remain until after the platen feed fingers engage with it, it is necessary that the stop fingers thereafter be shifted out of'the pat of the sheet just before itstarts on its final movement toward the tympan. The means zit-present adopted for effecting this timed shifting movement of the stop fingers comprises a crossbar 55" from which said fin gers extend rigid with the bar. This latter 15 carried by suitable rock arms 56, 56, se-

cnred to a rock shaft 56 mounted in the side frame extensions 12 and actuated by a cam 57 onthedriving shaft 5 through .a

suitahle'connection here comprising a cam form 57 cam roll 57 ,.link 5?, arm 57* extending from rock shaft 56,a1ud returning spring 57 Since the stop pins 55 are located close to the upper edge of the platen when the latter is in its open position it is desirable to render their displacement toward and away from the platen during their movement from operative to inoperative osition, and vice versa, comparatively sma l; cross bar 55" may therefore be rotatably mounted in the rock arms 56 and connected to a motion controller in the nature of a vibrating arm 58 journaled at one end to a stud 58 extending from a side frame extension 12' and at the other end to a crank pin 58- of the cross .bar' 55, the proportion and relation being preferably such, that the stop pins have a slight forward motion when moving downward to inoperative position. v

Une of the essential featuresof the'pres- ,flent invention involves the sliding of the blank sheet to be printed on to the tympan' and to its printing position, some time after the impression actlon' of the press has ceased, this sliding of the sheet commencing early enough to permit the. placing of the sheet against the tympanagage "pins before the next closing or impression movement of the press. In order to thus move the sheet onto the tympan it is moved from a surface which at least at the time of the passage of the sheet onto the tympan constitutes, substantialgy a continuation of the tympan surface.

ith respect to the time at which that it onto the tympan, we have found thatif, when the invention is applied, as in this instance, to a press having the so-called Gordon movement, the sheet-to-tympan movement is commenced when the platen approximately reaches the commencement of its dwell period, ample time will ensue before the platen starts to close (within the usual movement of the sheet is begun which passes speed capacity of such presses) to place the s 1 clear the platen some time prior to the leeginning of the return movement of the platen.

That is to'say,'as here organized, a plate or leaf 59 is provided with suitable bearing pieces. 59' by which it is journaled on the shaft 54, in a position such that the forward edge of a sheet on tapes 52 will be passed thereonto and over it until the sheet is arrested by stop pins 55 which work through suitable openin s 59 in the'leaf. The free.

edge portion oi the leaf, preferably tapering 'at its longitudinal extremity, extends.

somewhat over the upper edge of the platen -when in its dwell position; when the leaf is, rocked upward, the platen is free to move forward on its impressionmovement.

This rocking motion of the leaf may be rendered positive and certain in the manner disclosed according to which an arm 59 :1. rigid with the: leaf is rocked by a. cam 60 through an intervening cam' fork 60', com;

rollGO, returning sprlng 60, link 60*, bell crank 60", and link- 60"..

by the stop pins 55 ontothe t gets, designated by 61, each having a sheetengaging foot or end piece 61' of a nature Which will be understood'from the description already given with reference to'the sheet engagers on pile feed fingers 39. The

, 1201 For the purpose of sliding the sheet held pan we em ploy a suitable number of p aten feed finsheet engagers on the former fingers prior to the forward movement of the fingers are" caused to impinge against the ed e portlon of the sheet heldby stop pins a ter-which the latter are withdrawn as will be readily understood. i

Assuming now that the platen is about or has actually taken its position of rest or dwell and that leaf 59 has been rocked down on the tympan, the platen feed fingers move forward maintaining suflicient pressure upon the sheet underneath their sheet engagers to slide the sheet over the surface of the tympan without slipping on the sheet or disengaging therefrom until the sheet has reached its printing 'position against the lower tympan gage pins. Thereafter, and before the platen starts to close, the fin ers swing upward and are carried backwar to frames 12, 12 while their upper ends are rigidly connected by a tie cross bar .62 These parts are vibrated to and fro by a cam 63 and an associated cam roll 63 roll arm 63 rigidWvith rock shaft 62' and returning spring 63. V

Platen feed fingers 61 are seeuredto a sleeve 64:, they being preferably adjustable therealong, and in order to cause the sheet engagers on the platen .feed fingers to move in a substantially straight line parallel to the tympan surface but pressed downwardly thereon, during the forward excursion of the side arms 62, a motion corrector or rectiher is employed consisting of an arm 64' extending from sleeve64 and properly'actuated to give the result aforesaid from a cam 65' and intervening devices. embodying acam' fork cam roll 65 link 65 connecting the fork to a lever 65 pivoted tostud 65' on a side frame 12., returning spring 265, and link 65. a short shaft 66 rigid'with the aforesaid Cam 65 is here aflixed to bevel gear 10 and journaled in a bearing 66? on the side frame as indicated.

Since, in the present application of the inventionlvthe removal of the printed sheet brought back with the platen when itcomes to its. stop osition,- is not contemplated until after t e blank sheet starts toward and onto the tympan, such blank-sheetwill slide over the 'tympan to position thereon under the printed sheet. In order to insure its entrance under the upper edge of the latter means are ordinarily used for holdingti such edge somewhat off the surface of t'ym-.

pan, such means necessarily beingof character not to interfere with a. proper impression. We have found that a suitable number of curved or bent paper tabs '67 see Fig. 70

19, apparently fulfil every practical require. ment'. These tabs are inserted throu h proper slits in the tympan sheet 67', he d by the usual bails 67 one being indicated,

and held-in 'lace by adhesive with their" free spring=li e ends pointin toward the lower edge of the platen. heir location for each job. to be run on on the press is such as to hold the upper edge of theisheet slightly elevated when the sheet is free from the pressure of the form, as indicated in Fi 20.

ne of the features involved inthe use of the present apparatus is its adaptability to the ordinary method of make ready in which good practice demands the more or less particular location of the sheet on the tympan to secure a proper pressure distributlon and a consequent uniform impression.

As a general rule, therefore, the position of the lower each job.

Means areherein provided for causing the driving action of the platen sheet en'- tympan gage pins will vary with gagers on the sheet to ceasev the instant the rward edge 'of the sheet encounters the set lower age pins, the sheet and gage pins bein designated by S and G, respectivly, in 1g.. 2. This cessation of drivin action here results from the arrestof the motion of therock arms 62, etc, by means of a stop 68 extending from an arm 68', mounted concentrically with rock shaft 62' and manually adjustable for instance to the proper position aforesaid by means of a 108 threaded rod, 69 which passes loosely through an opening in a swivel piece 69', on

a side frame 12 and has on opposite sides of the swivel piece nuts 69 It should be stated in explanation of this it adjustable sto action that cam 63 effects the withdrawa or backward motion of rock arms 62 while the aforesaid spring '63 causes the forward or feeding action thereof, cam roll 63 riding down the cam surface of decreasing radius until stop 68 operates, whereupon the roll leaves the cam ifthe movement of the rock arms is arrested be-.'

- fore said arms reach the full extremity of the movement for which they are designed. 1M" Sometime thereafter the rock arms are brought backward by the continued rotation of the cam.

Cooperative with stops 68 is a projecting stop part 70 on a slide 70 (the purpose of Me which will presently a pear) mounted to a move longitudinally 0 one of the rock arms 62. I a

forward 10% For the purpose of withdrawing the printed sheet w ich, if previously undis- ,turbed, now liesupon the platen feed fingers 61, these latter may be utilized to carry it to a position from which it. may be taken 7 for final deposition, thus keeping the'upper surface of the sheet during, its withdrawal free from contact with any part and which would tend to smear the fresh impression thereon. I

It is by this means that the rinted sheet indicated and designated by is in this instance withdrawn and in order to prevent the printed sheet from sliding ofl? the platen feed fingers when the latter are swung upward and the sheet drawn away from gage pins Gr they are first lifted somewhat to clear the blank sheet underneath and simultaneously or immediately thereafter movedforward to carry a front hook or stop 7 0 on each finger 61 beyond the edge of the printed "sheet. This result is here attained by connecting slide 70' by a link 72 with lever 65* and so locating a depressed cam surface 72' on cam 65 that cam rolls 65 will descend thereonto before rock levers 62 begin their backward movement. As a result link 65 is depressed the' ends of the platen feed fingers raised, and slide 70' moving downward stoppro'ection 70 is withdrawn from stop- 68 and t e feed fingers move forward sufliciently to carry hooks 70 beyond the edge of the printed sheet.

By properly relating andtiming the surfaces of motion corrector cam 65 and rock arm cam 63 the ends of the platen feed fingers (the latter now carrying the printed sheet) may be caused during the first stage of their rearward movement, to draw back at an f om ward t acute angle to the tympan surface, in order to freely .disenga e the superposed sheet age pins G, Immediately afterrapid descent of link 65 tilts fingets 61 upward,'see the upper dotted posifeed fingers by any. suitable means. For

tion in Fig. 10, leaving the platen free't'o close for an impression.

The printed sheet may be taken oil the instance when they assume their extreme rearward position corresponding tothe rearward position of rockarms fifi the fingers still being tilted upward, they met be located between stretcher bars 73 at t e opposite ends of each of which is mounted a tape roll 73' carrying an endless tape 7'3 and which'bars sup orted by frame work 73 secured to side rames 12 are solocated and ggsgosed as permit the entrance of the platen fingers without interfering with the .sheet at the forward ends or the fingers.

These tapes may be driven in abackward direction by a sprocket chain connection 74 connecting driven sleeve 48 with shaft-7t of therear ta e rolls 73'.

When the p atom feed fingers rock downward to impinge their [sheet engagers against a new sheet, the printed sheet 1s left on the tapes and is by them conveyed rearwardly, eventually being taken from them by inclined fingers 7.5 from which they drop and pile upon a support 76 held by brackets 7 6 mounted-on said frames 12, each sheet right side-u and in a position in which it may be rea ily-ins'pected-by the pressman.

Of course support 76 will ordinarily be shiftable from its sheet-receiving position to facilitate restockin of the elevator, etc. "Where, as in thls embodiment, the fresh sheet'separated and fed from the pile remains for a time free from the pressure of any feed fingers, that is to say when forwarding tapes are used as in this instance toward the left in said figure (this side being usually employed for side register) as by a worm shaft 79 mounted in the frame 7 7 and engaging with a worm wheel 7 9' secured to each shaft 78, the worm shaft being driven by a sprocket andchain connection 80 from the aforesaid tape roll shaft 48'.

Until the tape-carried sheet, comes in contact with stop pins 55 the upper peripheral portions of friction rolls 78' remain below the plane of the upper stretches of the tapes, see rig. 16. While in contact therewith, however, and before the platen feed fin ers descend-upon thesheet, frame 77 ascen s in a'direction substantially normal to the plane of the tapes, the upper peripheral portions of the rotating friction. rolls 78' are raised above such plane, and the sheet being likewise raised is shifted to the left until its edge strikes a stop 81 previously adjusted to a oint in line with the registered position or that edge on the tymparn Thereafter the friction rolls slip upon the sheet until as frame 77 descends, the rolls are moved out of theiroperative position.

For the purpose of thus shifting the frame it may be mounted upon four substantially parallel crank arms 82, 82, 82, 82,

each having a crank pin 82' entering. a bearing in the side of the frame and connected 'in pairs to cross shafts 82 mounted in bearings in the frame extension 12, 12- These cross shafts are compelled to move in .uni-

son by means of a connecting rod 82 Icintstl to arms 82*, 82*, ri 'd with the she ts.

proper cam 83 on riving-shatth serves to cross shafts 82 In practice occasions arise in which it is desirable to feed the ress by hand, the automatic feeding and dialivery mechanism being then inoperative and its parts in a position that does not materially interfere with the convenient and necessar hand manipulation of the sheets. In ma g ready, also the conditions of inoperativeness of mechanism and accessibility of the press parts are also called for in practice. To fulfil these conditions the present feeding and delivery mechanism is so mounted as to be capable of being swung in its entirety toward and away from the press from a position, see Fig. 3, in which it leaves the feed board 84 exposed and an open space in front thereof in which the feeder or pressman may stand in an operative position, see

Fig. 2. -When the'sheet elevator is located considerably beyond the platen, as in this case, it is found desirable to give the side frames 12 a parallel motion to the rear and side in order to both open the space in front of the press and still keep clear of the press fly wheel when the parts are swun out.

The specific illustrated means or effectin the result aforesaid comprises a pair of substantially parallel suspension links 85, 85, jointed at their corres onding ends by pivot pins 85 85' to brac et pieces 86, 86, rigidly secured to a cross beam 87 secured by bolts 87 to the press frame. At their remaining ends ivot pins 85' joint the links to bracket-1i e extensions 88, 88 rigid with cross bar 15 already referred to as connecting side frames 12, 12.

It is apparent, additionally, that the feed and delivery mechanism'movement should be in proper timing with the press movement. In order to not only disconnect driv iug shaft 5 from operative connection. with. the press when the mechanism is swung eutward and away from the press as already described, but also to assure the inaction of the mechanism until the pro er timed relation is established, the following means may be employed:

That is to sa the before-mentioned bevel ear 10 may ave a recess in its hub 89 located in the o posite side of the gear face to that from which its aforesaid gear-sup porting shaft 66 extends. With this notch there is shown as adapted to engage a driving tooth 90 rigid with a short shaft 90' slidably mounted in the hollow'end of the before-mentioned side shaft 5-3. Shaft 90'is thrust outwardly by a spring 90 while a driving key90 is secured to and projects from shaft 90, the key being slidably mounted in a slot 90 in s aft. 8.

When} therefore, the fecdingand delivery said arms 62 is adapts mechanism is swung back into its operative position from its position 'of {non-use, if-

driving tooth 90, does not come opposite to and seat itself in its counterpart notch,

spring 90 will be compressed, the running press causin the driving tooth to slide idl i face of hub 89 until the toot 1 over the em comes opposite to the notch whereupon spring 90 will scatthe tooth therein and cause the driving of the mechanism as described.- I

When the parts are in their operative position as in ig. 10, their weight is mainly carried by'side lugs 91 one on each 'of the side frames 12, 12, each of the lugs here resting upon an extension 91 of the correiponding feed table bracket 51.

rockin means are indicated in Figs. 7 and 21 or firml securing the aforesaid mechanism secure y to the press when such mechanism is in its operative position. As

sai bracket extensions 91'. Looking shaft 92 may be lever 92'.

Means are also shown in connection with the lockin device for assuring. the withdrawal of 51s platen feed fingers to their extremefposition to the rear upon the unlocking 0 catches 92' thus freely permitting the outward swinging of the parts to their inoperative position, even though the press be stopped with sald fingers in a platenpressing position. Moreover, when the lockmg device is again actuated to lock the parts, the platen feed fingers are not free to resume their motion until the time arrives in the cycle of movement at which said fingers should be in their rearward posiprovided with a convenient hand tion. Thercupon the fingers are freed and permitted to continue their movements.

Referring'to Figs. 7 and 21', a in ,93 on a crank'arm 93' r1 'd with one 'o the rock to pla idly back and forth in a slot 93' in a in 93 hung from catch 92, during the vibratory action of the rock arms already described. en, however, hand lever 92 is swung to unicch the mechanism from the 'press the upper end of the slot engages with pin 93 net before the catches are fully clear of t s locking recesses 92 and rock arms are brought backward to a point slightly'beyond their limit of normal travel. This excess backward movement suiiices to engage a spring pressed detent 94 with a lug 94' on the hub of rock arm 62. lhe latter remains in this Mid ire

'ilili position until the time arrives during the operative movement in which arms 62, 62,

would assume the pro er position approximating to that in which they are held by ilii t of the hlank rock arms 62 cease their forward m0t1011.

latter they are never carried-far enough back to cause detent. 94 to become operative the latter merely pressing against the In the illustrated riding surface of lug 94'. arrangement and proportion of parts the feed board usually su plied with presses ofthe described type 0 trudes in the path of some of the parts. It has therefore been replaced by a feed board 84 having a hinged leaf 84 enabling the latter .to be thrown back and provide space for the parts. A The generaloperation of the foregoing automatic feed and delivery may be briefly described as follows:

Assumin the elevator to have been stocked wit the'pile of sheets to be printed and the mechanism to have beenbrought to a position in which platen feed fingers 61 are pressed down upon the edge portion of a registered sheet and the press to have been started, a printed sheet being upon the platen leaf 59 will rock down upon the platen as soon as it approximates to its dwell position. The platen feed fingers then start to slide the blank sheet forward over the surface 'of the tympan and under the printed sheet to position against the lower age pins G, G. As soon asthe edge sheet I encounters the gage pins.

stop projection coming into contact with adjusted St0p.68.' Sometime thereafter the downward motion of slide 70' will withdraw stop projection 7 0 from contact with stop 68 and the ends of the platen feed fingers will sli htl rise and move forward under the print sheet to en age the hook 71 with the edge thereof. I laten feed fingers now draw backward and rock upward carrying the printed sheet .to a position over the tapes 73 When the fingers rock downward the prmted sheet is carried to the place of deposition in a manner readily underst'ood.

In the meantime, pile feed fingers 39 have carried a fresh sheet forward between the sets of gripping rolls 48; 49, and the sheet has been brought down by tapes 52 against raised stop pins 55, the sheet is side registered by the ascent of frame 77 and given the position in which'thesheet engagers on the platen feed fingers press against it upon theirdescent.

Leaf 59 rocks'upward clear of the path of the platen and during the backward movement of pile feed fingers 39 above the surface of the pile, jogger fingers 50 shift the displaced sheets back to a common; normal position ready for a fresh separation and feeding. This action is repeated substantially during the continued running of the press.

- will be readily The action of the pawl 35, and pawl shifter 37 in causing an upward feed of the pile,'

1 as well as the action of driving tooth in causing a proper timing to occur if the mechanism is shifted back from an inoperative to an'operativeposition without an immediate reseating of the toothin its socket,

understood from the foregoin description.

l-Iaving 1. In a feed apparatus for-a platen press, the combination of a sheet separator and feeder for removing one sheet at a time from a pile thereof, and means for feeding each sheet so removed over the tympan surface and under the sheet which has previously been rintedthereon'.

2. n a feed apparatus for :1

described our invention, we claim:

platen press,

the combination of "a sheet separator and feeder for removing one sheet at a time from a p1le thereof, and means for shdln'g each sheet so removed over the tympan surface and under the printed sheet thereon. V

The combination of a sheet separator and feeder with a sheetregistering device and means for sliding'the registered sheet onto and over the tympan surface under the printed sheet thereon to its printing position. Y

4. The combination with a sheet separator and feeder, of mechanism for sliding each sheet in succession onto the tympan surface and over the same-under the printed sheet thereon to the printing position determined by the desired location of the gage pins on said surface.

5. In a feed apparatus for a platen press it the combination of a platen feed finger having at one end a sheet engager adapted to engagewith the sheet and slide the same over the'tympan surface, means for holding the upper edge of the printed sheet on the tympan surface somewhat above said surface, mechanism for reciprocating said finger from apoint beyond the platen to a point thereon, and means for bringing a sheet under said sheet engager before the finger begins its forward movement.

6. In a feed and delivery apparatus for a platen (press, and in which the; delivery of the printe sheet 18 effected after the fresh sheet is placed upon the tympan surface, the combination of means for sliding the fresh sheet over the tympan surface. and means for holding the upper edge of the printed sheet on said surface somewhat above the same as the sliding sheet approaches and passes unpress to printing position thereon, of means for holding the upper edge of the printed sheet on said surface somewhat above the same as the sliding sheet approaches and mechanism for then withdrawing the fingers with the printed sheet thereon, and means for ultimately removing the sheet from the fingers and depositing the same.

9. The combination in an apparatus of the character described of an automatically operative pile elevator, a sheet separator and feeder, reciprocative platen feed fin ers adapted during their forward stroke to eed a fresh sheet onto the tympan surface under the printed sheet thereon and during their backward stroke ,to carry with them the printed sheet, and means for removing the printed sheet from the fingers and depositmg the same.

10. The combination in an apparatus of the character described, of an automatically operative pile elevator, a sheet separator and feeder, a sheet register, reciprocative platen feed fingers ada tedrduring their forward stroke to feed a r'esh sheet onto the tympan surface under the printed sheet thereon and during their backward stroke to'carry with them the printed sheet, and means for removing the printed sheet fromthe fingers and depositing the same.

11. The combination with a press including a. bed, a platen, and means for imparting to the platen a cycle of movement during the former in printing position and during the latter part of which the platen is in sheet-receiving position, of means for properly positioning the sheet on the platen, and means, cooperating with said positioning means, for feeding sheets to' the platen, said feeding means including a sheet-moving member movable from h position clear of theupper edge of theplaten lengthwise of the platen toward the lower edge thereof and back again, and means for effecting such movenient of said member during the latterpart of the platen cycle.

12. The combination with a printing press including a bed, a platen having an abutment thereon, and means for imparting to said platen a cycle of movement during the former part-of which the platen is in a printing position and during the latter part of which the platen is in a sheet-receiving position, of means-at the rear of said platen, and adjacent the upper edge thereof, for,

supporting a .pluralityof sheets, a sheet moving member movable from a position clear of the upper edge of the platen lengthpart of which the platen is wise of the platen toward the lower edge thereof and back again, and cooperating with said abutment, and means for imparting the said movement to the said member during the latter part of the cycle of the platen. 13. The combination with a laten printmg press, of a frame pivoted adjacent thereto adapted to be swung into or out of op-' erative position with respect to said press, a carriage reciprocating wlthln said frame,

radially movable feeder arms carried by the carriage for carrying sheets of paper to and from the platen of the printing press, and means for operating said carriage and ada ted to interlock with a necessary operatlve part of the press when the frame is swung around into operative position.

14:. The combination of a platen printing press, of a frame pivoted adjacent thereto 3 adapted to be swung into or out'of operative posltlon with'respect to said press, a reciprocating carriage wltlnn the frame,

radially movable reciprocating arms carried by the carriage for conveying sheets of paper to and. from the platen printing press,

and means operated by the press for operatmg sa d arms when the frame is swung into operative position.

15. The combination with a platen printing press, of a frame pivoted adj acentthereto adapted to be swung into or out of operative position with respect to said press, a carriage reciprocating in said frame, radially movable reciprocating feeder arms carried by the frame for conveying the sheets of paper to and from the platen of the press, means for reciprocating said carriage, means for moving the arms radially, said means operated by an operative part of the press when the frame is swung around into operation. a

16. The combination with a platen printing press, of a frame pivoted adjacent thereto and adapted to be swung into or outof operative position in respect to said press, a carria e within said frame, radially movable feeder arms carried by the carriage for conveying sheets of paper to and from the platen of the printing press, and means for operating the said carriage and adapted to be interlocked with the necessary operative a reciprocating carriage within the frame,

arms carried by the carriage for conveying sheets of paper to and from the platen of the printing press and means operated by the press for operating the arms when the frame is swun into operative position.

' 18. The com ination with a press including a bed, a platen,

"ing to. the platen a cyc ing the former part of which the ing a bed,

and means for impartis of movement durlaten is in printing posltion and during t e latter artof which the platen is in sheet receiving position, ofiimeans for properly-positioning the sheet on the platen, and means, adjustable to accord with the location of said positioning means, for feedingsheets to the platen, said feeding means including a sheet moving member movable from a position clear of the upper edge of the platen lengthwise of the platen toward the lower edge thereof and back again, effecting such movement of said member durin the latter part of the platen cycle.

19. lhe combination with a printing press including a bed, a platen having an abutment thereon, and means for imparting to said platen a cycle-of movement during'the former part of which the platen is in a printing position and during the latter part of which the platen is in a sheet receiving position, of'means at the rear of said platen,

and adjacent the upper edge thereof, for

supporting a plurality of sheets, a sheet moving member movable froin a position clear of the upper edge of the platen lengthwise of the platen toward the lower edge thereof and back again, and adjustable to accord with the location of said abutment, and means for imparting the saidmovement to the said member during the latter part of the cycle of the platen.

20. The combination with a press includa platen, and means for imparting to the platen a cycle of movement dun ing the former part of which the platen is in. printing position and during the latter part of whichthe platen is in sheet-receiv= ing position, of feeding means comprising a member for engaging and frictionally pushing a sheet, said member being movable from a position clear of the upper edge of the platen lengthwise of the platen toward the lower edge thereof and back again, and

means for efi'ecting such movement of said pushing member during the latter part of the platen cycle.

21. Means for feeding sheets to a platen press, comprising a sheet-moving member, and means for imparting to said-member amovement forward over the platen and back again after -each impression, part of the forward portion of said movement being substantially parallel with the platen.

22, Means for feeding sheets to a platen press, comprising .a sheet-moving member,

and means for imparting to said member a movement forward over the platen and back again after each impression, part of the forward portion of said movement being close to the platen lel therewith; 1

23. Means for feeding sheets to a and means for and substantially paralmovable from a sheet-receiving position to an impression posi tion, comprisi a sheet-moving member, and means for 1m arting to said member a movement forwar over the platen and back again while the platen issubstantially in its sheet-receiving position, part of the forward portion of said movement being substantially parallel with the platen.

24. Means for feeding sheets to a press having a, platen movable from a sheet-re ceiving position toan impression position comprising a sheet-moving member, and means for imparting to said member a movement forward over the platen and back again while the platen is substantially in its sheet-receiving position, part of the forward portion of said gnovement being close to the. platen and substantially parallel therewith.

25. The combination with a press including a bed, a platen, and means for imparting to the platen a cycle of movement during the former part of which the platen is in printing position and during the latter part of which the platen is in sheet-receiving position, of feeding means comprising a sheet-moving member, and'means "for imparting to said member a movement forward over the platen and back again during the latter part of the platen cycle, part of the forward portion of said movement being substantially parallel with the platen.

26. lhe combination with a pressinclnding a bed, a platen, and means for imparting to the platen a cycle of movement during the former part of which the platen is in printing position and during the latter part of which the platen is in sheetreceiving position, of feeding means comprising a sheet-moving membenand means having a platen for imparting to said member a move.

ment forward over the platen and back again during the latter part of the platen cycle, a part of the forward portion of said movement being close to the platen and substantially parallel therewith.

27. The combination with a press inclnding a bed, platen, and means for imparting to the platen a cycle of movement during the former part of which the platen is in printing position and during the latter part of which the platen is in sheet-receivin p0 s'ition, of feeding means comprising a s eetfpath of the platen forward 

